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2 years ago

Write an expression equivalent to x^2+7x+6x

Mathematics

1 answer:

Readme [11.4K]2 years ago

4 0

Answer:

x(x+13), or x^2+13x

Step-by-step explanation:

You factor one x out, or you can just add the x values.

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Use the quadratic formula to solve 2y² + 6y – 8 = 0.

s2008m [1.1K]

{–4, 1} I'm pretty sure!!

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4 years ago

A leprechaun places a magic penny under a girls pillow. The next night there are 2 magic pennies under her pillow. The following

kiruha [24]

Answer:

After 47 days she will have more than 90 trillion pennies.

Step-by-step explanation:

At the beginning there was 1 penny. At the second day the amount of pennies under the pillow became 2.

The amount of pennies doubled each day. So the series is,

$1,2,4,8,16,32,.....$

This series is in geometric progression.

As the pennies from each of the previous days are not being stored away until more pennies magically appear so the sum of series will be,

$S_n=\dfrac{a(r^n-1)}{r-1}$

where,

a = initial term = 1,

r = common ratio = 2,

As we have find the number of days that would elapse before she has a total of more than 90 trillion, so

$\Rightarrow 90\times 10^{12}\le \dfrac{1(2^n-1)}{2-1}$

$\Rightarrow 90\times 10^{12}\le \dfrac{2^n-1}{1}$

$\Rightarrow 90\times 10^{12}\le 2^n-1$

$\Rightarrow 2^n\ge 90\times 10^{12}+1$

$\Rightarrow \log 2^n\ge \log (90\times 10^{12}+1)$

$\Rightarrow n\times \log 2\ge \log (90\times 10^{12}+1)$

$\Rightarrow n \ge \dfrac{\log (90\times 10^{12}+1)}{\log 2}$

$\Rightarrow n \ge 46.4$

$\Rightarrow n\approx 47$

8 0

3 years ago

Please help with these three questions! Thank you! (No links! No trolls! Will mark brainliest!)

gtnhenbr [62]

Answer:

1. 4*10^7

2. 5.1*10^-7

3.9,842,000,000(9.842*10^9)

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2 years ago

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Angle W is a right angle.

Alex73 [517]

What’s the question?

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3 years ago

Evaluate 15/r -1 when r = 5

Juli2301 [7.4K]

$\frac{15}{r}-1=\frac{15}{5}-1=3-1=2$

2)
$\frac{15}{r-1}=\frac{15}{5-1}=\frac{15}{4}=3\frac{3}{4}=3.75$

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3 years ago

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